How many hours does it take to make a friend?
The best-known answer comes from Jeffrey Hall, a communication professor at the University of Kansas, whose 2019 study in the Journal of Social and Personal Relationships was titled, literally, "How many hours does it take to make a friend?" His estimates:
| Stage | Hours together | What it feels like |
|---|---|---|
| Acquaintance → casual friend | ~50 | You'd say hi, grab a coffee, maybe invite them to a group thing |
| Casual friend → friend | ~90 | You make plans one-on-one and actually look forward to them |
| Friend → close friend | 200+ | You'd call them with bad news, and they'd call you |
These aren't hard thresholds. Some people click faster, some never click no matter how long they spend together. But they're a useful order of magnitude: a close friendship costs something in the range of hundreds of hours, not dozens.
Where the numbers come from
Hall ran two studies. In the first, he surveyed adults who had recently moved to a new city about someone they'd met since arriving: how much time they'd spent together, what they did, and how close they now felt. In the second, he followed first-year university students, checking in shortly after they arrived on campus and again several weeks later, to see which new acquaintances had turned into friendships and how many hours that had taken.
Both groups were chosen for the same reason: people in a new place are actively making friends from scratch, so you can watch the process happen instead of asking someone to remember how a 15-year friendship started. The two studies pointed to the same rough pattern, with the chance of moving up a level rising sharply around the 50-hour, 90-hour, and 200-hour marks.
Not every hour counts the same
The part of Hall's research that gets repeated less often is arguably the more useful part. Time spent together because you had to be there, working side by side or sitting in the same class, did much less to build closeness than time spent together by choice. What moved people from acquaintance to friend was hanging out, joking around, and catching up on each other's lives.
That explains a pattern most people have lived through: you can share an office with someone for three years and still not really be friends, then get close to someone you met at a wedding in six months of weekend plans. The office hours were real hours, but they weren't the kind that count. Hall also found that the quality of conversation mattered: talking about how your life is actually going builds more closeness than logistics and small talk.
What 200 hours looks like on a real calendar
Two hundred hours sounds abstract until you divide it by an actual schedule.
| How often you see them | Hours per year | Time to reach 200 hours |
|---|---|---|
| 4 hours every week | ~208 | About a year |
| 3-hour hangout every other week | ~78 | About 2.5 years |
| 3-hour dinner once a month | 36 | About 5.5 years |
| A weekend visit twice a year | ~60 | About 3.5 years |
The monthly-dinner row is the one that surprises people. A friendship built around a standing monthly dinner feels like a solid, regular friendship, and it is. But if you started from zero, it would take more than five years at that pace to reach the level Hall associates with close friends. Occasional long stretches of time, like a trip or a weekend staying with someone, do a lot of work because they pack dozens of hours into a few days.
Why making friends as an adult feels so hard
School is a friendship machine precisely because it hands out hours for free. You see the same people five days a week, with lunches, breaks, and after-school time that nobody had to schedule. A first-year university student can pass 200 hours with a roommate or a close classmate in a single semester without trying.
Adult life turns every hour into an appointment. Each one competes with work, partners, kids, commutes, and simple tiredness, and each one has to be proposed, agreed on, and occasionally rescheduled. That doesn't mean adults can't make close friends. It means that the friendships which do form tend to belong to people who deliberately, repeatedly made time, often more than they realized they were making. It's the same dynamic I wrote about in the running joke my friend group never let die: the effort that used to be automatic has to become intentional.
Keeping a friendship is cheaper than building one
Hall's research is about forming friendships, not maintaining them, and the good news is that an existing close friendship doesn't need another 200 hours every year. But it does need something. Longitudinal research by Sam Roberts and Robin Dunbar, the same Dunbar behind Dunbar's number, found that emotional closeness with friends declined when contact dropped off, and friendships were more vulnerable to that decline than family relationships. Family ties tend to survive long silences. Friendships usually don't, at least not without a bit of contact to keep them going.
That's why the slow drift is so easy to miss. Nothing goes wrong. You just see someone a little less this year than last, and a little less again the year after. If any of that sounds familiar, these are the signs worth watching for.
Do you know how many hours you actually spend with your friends?
Most people don't, and it's the kind of thing that feels obvious right up until you check. That's the reason I added a Time Together stat to each person's profile in BuddyLog. Every time you log a hangout, its length gets added up, and you can see month by month how many hours you spent with that person over the past year. It won't tell you whether a friendship is a good one. It will tell you, honestly, whether the person you call your best friend got 40 hours of your year or four, and whether the new friend you're excited about is actually getting the time Hall's numbers say it takes. For the bigger picture of why logging the people you care about is worth doing at all, see the full guide to keeping a friendship journal.
Quick answer: According to Jeffrey Hall's 2019 research, it takes roughly 50 hours together to become casual friends, about 90 hours to become friends, and more than 200 hours to become close friends. Time you choose to spend together, hanging out and catching up, counts far more than time you share at work or school.
FAQ
How many hours does it take to make a friend?
About 50 hours to go from acquaintance to casual friend, about 90 hours to become a friend, and more than 200 hours to become a close friend, according to research by Jeffrey Hall at the University of Kansas.
How long does it take to make a close friend?
More than 200 hours of shared time. That's roughly a year at four hours a week, or over five years if you only meet for a monthly dinner.
Does time at work or school count toward making a friend?
Less than you'd think. Hall found that obligatory time together, like working side by side, did much less for closeness than time spent together by choice: hanging out, joking, and catching up.
Why is it harder to make friends as an adult?
Adults stop getting free, unplanned hours with the same people. School provides hundreds of them automatically. After that, every hour has to be scheduled on purpose, so reaching 200 hours with someone new can take years.
